Class: Migr8::RepositoryOperation

Inherits:
Object
  • Object
show all
Defined in:
lib/migr8.rb

Instance Method Summary collapse

Constructor Details

#initialize(repo) ⇒ RepositoryOperation

Returns a new instance of RepositoryOperation.



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# File 'lib/migr8.rb', line 352

def initialize(repo)
  @repo = repo
end

Instance Method Details

#apply(versions) ⇒ Object 



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# File 'lib/migr8.rb', line 512

def apply(versions)
  migs = _get_migrations_in_history_file(versions, false)
  @repo.apply_migrations(migs)
end

#delete(version) ⇒ Object 



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# File 'lib/migr8.rb', line 460

def delete(version)
  @repo.delete_migration(version)
end

#downgrade(n) ⇒ Object 



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# File 'lib/migr8.rb', line 488

def downgrade(n)
  migs_hist, migs_dict = _get_migrations_hist_and_applied()
  ## index of current version
  curr = migs_hist.rindex {|mig| mig.applied? }
  ## error when unapplied older version exists in target migrations
  migs_applied = curr ? migs_hist[0..curr] : []
  if curr
    j = migs_applied.index {|mig| ! mig.applied? }
    raise MigrationError.new("apply #{migs_applied[j].version} at first.") if j && j < curr
  end
  ## unapply n migrations
  migs_to_unapply = n && n < migs_applied.length ? migs_applied[-n..-1] \
                                                 : migs_applied
  if migs_to_unapply.empty?
    puts "## (nothing to unapply)"
  else
    #migs_to_unapply.reverse_each do |mig|
    #  puts "## unapplying #{mig.version}  \# [#{mig.author}] #{mig.desc}"
    #  @repo.unapply_migration(mig)
    #end
    @repo.unapply_migrations(migs_to_unapply.reverse())
  end
end

#history ⇒ Object 



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# File 'lib/migr8.rb', line 356

def history
  mig_hist, mig_dict = _get_migrations_hist_and_applied()
  s = ""
  mig_hist.each do |mig|
    s << _to_line(mig)
  end
  if ! mig_dict.empty?
    s << "##\n"
    s << "## Applied to DB but not exist in history file:\n"
    s << "##\n"
    mig_dict.each {|ver, mig| s << _to_line(mig) }
  end
  return s
end

#inspect(n = 5) ⇒ Object 



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# File 'lib/migr8.rb', line 380

def inspect(n=5)
  mig_hist, mig_dict = _get_migrations_hist_and_applied()
  pos = mig_hist.length - n - 1
  i = mig_hist.index {|mig| ! mig.applied? }  # index of oldest unapplied
  j = mig_hist.rindex {|mig| mig.applied? }   # index of newest applied
  start = i.nil? ? pos : [i - 1, pos].min
  start = 0 if start < 0
  if mig_hist.empty?
    status = "no migrations"
    recent = nil
  elsif i.nil?
    status = "all applied"
    recent = mig_hist[start..-1]
  elsif j.nil?
    status = "nothing applied"
    recent = mig_hist[0..-1]
  elsif i < j
    status = "YOU MUST APPLY #{mig_hist[i].version} AT FIRST!"
    recent = mig_hist[start..-1]
  else
    count = mig_hist.length - i
    status = "there are #{count} migrations to apply"
    status = "there is a migration to apply" if count == 1
    recent = mig_hist[start..-1]
  end
  missing = mig_dict.empty? ? nil : mig_dict.values
  return {:status=>status, :recent=>recent, :missing=>missing}
end

#new(version, author, desc, opts = {}) ⇒ Object 



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# File 'lib/migr8.rb', line 371

def new(version, author, desc, opts={})
  if version && @repo.migration_file_exist?(version)
    raise MigrationError.new("#{version}: failed to create migration file because file already exists.
Please run 'File.basename($0) edit #{version}' to see existing file.")
  end
  mig = @repo.create_migration(version, author, desc, opts)
  return mig
end

#show(version = nil, load_from_db = False) ⇒ Object 



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# File 'lib/migr8.rb', line 425

def show(version=nil, load_from_db=False)
  migs = load_from_db ? @repo.migrations_in_history_table() \
                      : @repo.migrations_in_history_file()
  if version
    mig = migs.find {|mig| mig.version == version }  or
      raise MigrationError.new("#{version}: no such migration.")
  else
    mig = migs.last or
      raise MigrationError.new("no migrations to show.")
  end
  if load_from_db
    @repo.fetch_details_from_history_table(mig)
    #assert mig.instance_variable_get('@up_script')   != nil
    #assert mig.instance_variable_get('@down_script') != nil
  end
  #
  buf = ""
  buf   << "version:     #{mig.version}\n"
  buf   << "desc:        #{mig.desc}\n"
  buf   << "author:      #{mig.author}\n"
  buf   << "vars:\n"                           unless load_from_db
  mig.vars.each do |k, v|
    buf << "  - %-10s " % ["#{k}:"] << v.inspect << "\n"
  end                                          unless load_from_db
  buf   << "applied_at:  #{mig.applied_at}\n"  if load_from_db
  buf   << "\n"
  buf   << "up: |\n"
  buf   << mig.up_script.gsub(/^/, '  ')
  buf   << "\n"
  buf   << "down: |\n"
  buf   << mig.down_script.gsub(/^/, '  ')
  buf   << "\n"
  return buf
end

#status ⇒ Object 



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# File 'lib/migr8.rb', line 409

def status
  ret = inspect()
  s = ""
  s << "## Status: #{ret[:status]}\n"
  if ret[:recent]
    s << "## Recent history:\n"
    ret[:recent].each {|mig| s << _to_line(mig) }
  end
  if ret[:missing]
    s << "## !!! The following migrations are applied to DB, but files are not found.\n"
    s << "## !!! (Try `#{File.basename($0)} unapply -x abcd1234` to unapply them.)\n"
    ret[:missing].each {|mig| s << _to_line(mig) }
  end
  return s
end

#unapply(versions) ⇒ Object 



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# File 'lib/migr8.rb', line 517

def unapply(versions)
  migs = _get_migrations_in_history_file(versions, true)
  @repo.unapply_migrations(migs)
end

#unapply_only_in_database(versions) ⇒ Object 



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# File 'lib/migr8.rb', line 522

def unapply_only_in_database(versions)
  migs = _get_migrations_only_in_database(versions)
  @repo.unapply_migrations(migs, true)
end

#upgrade(n) ⇒ Object 



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# File 'lib/migr8.rb', line 464

def upgrade(n)
  migs_hist, migs_dict = _get_migrations_hist_and_applied()
  ## index of current version
  curr = migs_hist.rindex {|mig| mig.applied? }
  ## error when unapplied older version exists
  if curr
    j = migs_hist.index {|mig| ! mig.applied? }
    raise MigrationError.new("apply #{migs_hist[j].version} at first.") if j && j < curr
  end
  ## unapplied migrations
  migs_unapplied = curr ? migs_hist[(curr+1)..-1] : migs_hist
  ## apply n migrations
  migs_to_apply = n.nil? ? migs_unapplied : migs_unapplied[0...n]
  if migs_to_apply.empty?
    puts "## (nothing to apply)"
  else
    #migs_to_apply.each do |mig|
    #  puts "## applying #{mig.version}  \# [#{mig.author}] #{mig.desc}"
    #  @repo.apply_migration(mig)
    #end
    @repo.apply_migrations(migs_to_apply)
  end
end